Volume 22 Issue 1
Feb.  2014
Turn off MathJax
Article Contents
ZHANG Yafei, XU Guangli, HU Huanzhong. 2014: PFC3D MESO-SCALE SIMULATION OF SELF-BORING PRESSURE-METER TEST WITH PROBES OF DIFFERENT LENGTH-TO-DIAMETER RATIOS. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 91-97.
Citation: ZHANG Yafei, XU Guangli, HU Huanzhong. 2014: PFC3D MESO-SCALE SIMULATION OF SELF-BORING PRESSURE-METER TEST WITH PROBES OF DIFFERENT LENGTH-TO-DIAMETER RATIOS. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 91-97.

PFC3D MESO-SCALE SIMULATION OF SELF-BORING PRESSURE-METER TEST WITH PROBES OF DIFFERENT LENGTH-TO-DIAMETER RATIOS

Funds:

  • Received Date: 2013-04-23
  • Rev Recd Date: 2013-10-15
  • Publish Date: 2014-02-25
  • The self-boring pressure-meter(SBMP) has little to no disturbance to the surrounding soil and has a long measurement depth. It can determine the stress and strain curve of soil at depth and has an extensive application prospect in the determination of soil parameters and foundation bearing capacity. However, because of the limitations of the analytical tools and research level, the deformation response of surrounding soil during loading process in SBMP test with probes of different length-to-diameter ratio (L/D) has seldom been studied up to present. At the same time, the determination of the soil parameter is closely related to its deformation mechanism. Based on this, the self-boring pressure-meter(SBPM)test with different length-to-diameter ratio(L/D=6, 10, 15, 20) is simulated by PFC3D(Particle Flow Code in Three Dimensions) program in this study. The development and distribution of the displacement and stress field of the soil surrounding the probe are studied. The results of numerical experiments show that the distribution of the displacement and radial-stress field can be divided into two forms according to the size of the L/D. When L/D equals 6,the distribution shape of the displacement and stress field shows an arc-shaped lanterns appearance; the deformation of the surrounding soil along the height of the probe dose not satisfy with the plane strain and axial symmetry conditions. And the soil stress of L/D=6 is smaller than the later three. However, when L/D has a value of 10, 15 and 20,the distribution shape shows a straight wall lanterns appearance; the deformation of the surrounding soil along the height of the probe basically satisfies with the plane strain and axial symmetry conditions. The stress distribution along the height of the probe is relatively uniform than that of the L/D=6, and the soil stress decreases with the increase of the L/D. Several radial stress cores which are approximately symmetrical distribution have formed near both sides of the probe. In addition, the radial-stress at the borehole wall descends in a negative exponential form with the increase of the L/D when the radial strain of the probe is constant.
  • loading
  • [1] 沈珠江. 原状取土还是原位测试——土质参数测试技术发展方向刍议[J].岩土工程学报, 1996, 18 (5): 90~91. Shen Zhujiang. Soil sampling on site or in-situ testing: A preliminary research on development of soil parameters testing technology. Chinese Journal of Geotechnical Engineering, 1996, 18 (5): 90~91.

    [2] 孟高头. 土体原位测试机理、方法及其工程应用[M].北京:地质出版社, 1997. Meng Gaotou. The Mechanism, Method and Engineering Application of In-situ Test of Soil. Beijing: Geological Publishing House, 1997.

    [3] Yu H S.Cavity Expansion Methods in Geomechanics[M]. The Netherlands: Kluwer Academic Publishers, 2000.

    [4] Wroth C P. The interpretation of in situ soil tests[J]. Geotechnique, 1984, 34 (4): 449~489.

    [5] Gibson R E,Anderson W F.In-situ measurement of soil properties with the pressuremeter[J]. Civil Engineering Public Works Review, 1961, 56: 615~618.

    [6] Yeung S K,Carter J P.Interpretation of the pressuremeter test in clay allowing for membrane end effects and material non-homogeneity[A]//The Proceedings of the 3rd International Symposium on Pressuremeters[C]. Oxford, 1990, 199~208.

    [7] Yu H S.Cavity Expansion Theory and Its Application to the Analysis of Pressuremeters[D].The University of Oxford, 1990.

    [8] Houlsby G T,Carter J P.The effects of pressuremeter geometry on the results of tests in clay[J]. Geotechnique, 1993, 43 (4): 567~576.

    [9] Yu H S,Charles M T,Khong C D.Analysis of pressuremeter geometry effects in clay using critical state models[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2005, 29 (8): 845~859.

    [10] 郝冬雪. 孔扩张理论研究及自钻式旁压试验数值分析.大连:大连理工大学, 2008. Hao Dongxue. Study on Cavity Expansion Theory and Numerical Analysis of Self-Boring Pressremeter Test. Dalian: Dalian University of Technology, 2008.

    [11] 郝冬雪, 陈榕,栾茂田,等.SBPT测定饱和黏土不排水强度的数值分析[J].岩土力学, 2010, 31 (7): 2324~2328. Hao Dongxue, Chen Rong, Luan Maotian, et al. Numerical analysis of SBPT for estimation of undrained shear strength. Rock and Soil Mechanics, 2010, 31 (7): 2324~2328.

    [12] Cundall P A,Strack O D L.A discrete numerical model for graunlar assemblies[J]. Geotechnique, 1979, 29 (1): 47~65.

    [13] 王泳嘉. 离散单元法——一种适用于节理岩石力学分析的数值方法[A]//第一届全国岩石力学数值计算及模型试验讨论会论文集[C].吉安, 1986, 32~37. Wang Yongjia. Discrete element method—A numerical method suitable for analyisis in jointed rocks. The Proceeding of the 1st Nationwide Symposium on Numerical Calculation and Model Test of Rock Mechanics. Ji'an,1986, 32~37.

    [14] 周健, 池永,池毓蔚,等.颗粒流方法及PFC2D程序[J].岩土力学, 2000, 21 (3): 271~274. Zhou Jian, Chi Yong, Chi Yuwei, et al. The method of particle flow and PFC2D code. Rock and Soil Mechanics, 2000, 21 (3): 271~274.

    [15] 徐肖峰, 魏厚振,孟庆山,等.粗粒含量对砾类土直剪过程中强度与变形特性影响的离散元模拟研究[J].工程地质学报, 2013, 21 (2): 311~316. Xu Xiaofeng, Wei Houzhen, Meng Qingshan, et al. Dem simulation on effect of coarse gravel content to direct shear strength and deformation characteristics of coarse-grained soil. Journal of Engineering Geology, 2013, 21 (2): 311~316.

    [16] 张亚飞, 徐光黎,申艳军,等.自钻式原位剪切旁压模型试验颗粒流模拟[J].工程地质学报, 2012, 20 (5): 855~861. Zhang Yafei, Xu Guangli, Shen Yanjun, et al. PFC numerical simulation of self-boring in-situ shear pressuremeter model test. Journal of Engineering Geology, 2012, 20 (5): 855~861.

    [17] 周健, 池毓蔚,池永,等.砂土双轴试验的颗粒流模拟[J].岩土工程学报, 2000, 22 (6): 701~704. Zhou Jian, Chi Yuwei, Chi Yong, et al. Simulation of biaxial test on sand by particle flow code. Chinese Journal of Geotechnical Engineering, 2000, 22 (6): 701~704.

    [18] 周健, 张刚,曾庆有.主动侧向受荷桩模型试验与颗粒流数值模拟研究[J].岩土工程学报, 2007, 29 (5): 650~656. Zhou Jian, Zhang Gang, Zeng Qingyou. Model tests and PFC2D numerical analysis of active laterally loaded piles. Chinese Journal of Geotechnical Engineering, 2007, 29 (5): 650~656.

    [19] 邓益兵, 周健,刘文白,等.螺旋挤土桩下旋成孔过程的颗粒流数值模拟[J].岩土工程学报, 2011, 33 (9): 1391~1398. Deng Yibing, Zhou Jian, Liu Wenbai, et al. PFC numerical simulation of augered piling of soil displacement screw piles. Chinese Journal of Geotechnical Engineering, 2011, 33 (9): 1391~1398.
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索
    Article views (3036) PDF downloads(675) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint